Mathematical modeling of electric and hydraulic resistances of reconstructed carbon felt electrodes using micro-computed tomography

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F23%3A43968960" target="_blank" >RIV/49777513:23640/23:43968960 - isvavai.cz</a>

Alternative codes found

RIV/60461373:22340/23:43926201

Result on the web

<a href="https://doi.org/10.1016/j.cej.2023.141424" target="_blank" >https://doi.org/10.1016/j.cej.2023.141424</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cej.2023.141424" target="_blank" >10.1016/j.cej.2023.141424</a>

Result language

angličtina

Original language name

Mathematical modeling of electric and hydraulic resistances of reconstructed carbon felt electrodes using micro-computed tomography

Original language description

Redox flow batteries of various chemistries are potential electrochemical energy storages for residential accumulation and grid stabilization. Decoupled power and capacity represent the main advantages of the technology. The key component of the battery, the carbon felt electrode, does not participate in the electrochemical reaction directly, but it provides active sites for the electrochemical reaction of electroactive ions. In addition, the electrode contributes to the battery stack polarization through the charge transfer, ohmic and mass transport resistances and increases the hydraulic resistance of the battery stack and resulting pumping losses associated with the electrolyte circulation. In this contribution, a mathematical model was developed to evaluate geometrical parameters and simulate the effective electric conductivity and hydraulic resistance of two commercially available carbon felt electrodes using their microtomography images. These were preprocessed and binarized into a reconstructed computation domain. Geometric descriptors, such as porosity, specific surface area and fiber spatial orientation, were calculated using in-house developed algorithms. The area specific resistance and hydraulic resistance were then estimated and validated against our own experimental data, which were measured for both felts under six different relative compressions. The results of the fiber spatial orientation showed a change in the orientation of the carbon felt fiber with increasing compression rate. As the result of increasing compression, the electrical resistance decreases, whereas the hydraulic resistance increases. Interestingly, due to a change in spatial fiber orientation, Carman-Kozeny constant is also decreasing with increasing compression. The developed model can be further used to optimize the textural properties of 3D fibrous electrodes from hydraulic and ohmic point of view, within the development of flow electrochemical reactors

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

<a href="/en/project/TK02030001" target="_blank" >TK02030001: Research and development of advanced flow energy storage technologies</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Chemical Engineering Journal

ISSN

1385-8947

e-ISSN

1873-3212

Volume of the periodical

458

Issue of the periodical within the volume

FEB 15 2023

Country of publishing house

CH - SWITZERLAND

Number of pages

9

Pages from-to

—

UT code for WoS article

000963215600001

EID of the result in the Scopus database

2-s2.0-85150800625